[Wauthan]

Adding themes would indeed by very interesting. Moreso if there was additional themes added to Dom3. Since chosing two themes would impair an even higher cost and more forced scales it oughto be fairly balanced.

It might be fairly hard to get this feature into the game though since it would require both UI reconfiguration, additional theme balancing, more bugs and more code to plow trough.

Having a national theme and a "culture" theme seems to be a good way to incorporate new strategic and replayble elements into Dominions. Also a way to fulfil wishes for new factions without actually adding new factions.

As an example a "Kingdom of the Ratmen" theme for Pangea with a "Demon Worshipers" theme would add a few new ratty units to Pangea and boost summoned demons inside the dominion. Strategy and game experience would be very different from "plain vanilla" Pangea.